Device for inserting branch lines on mechanical-telephone lines



(No Model.)

G. F. SHAVER. DEVICE FOR INSERTING BRANCH LINES 0N MECHANICAL TELEPHONE LINES.

No. 444,461. Patented Jan. 13,1891.

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UNITED STATES PATENT OFFICE.

GEORGE FREDERICK SHAVER, OE NEXV YORK, N. Y., ASSIGNOR TO THE SHAVER CORPORATION, OF NElV JERSEY.

DEVICE FOR lNSERTING BRANCH LINES ON MECHANICADTELEPHONE LlNES.

SPECIFICATION forming part of Letters Patent No. 444,461, dated January 13, 1891.

Application filed March 22, 1890. Serial No, 344,9 1-2- (No model) To all whom it may concern:

Be it known that I, GEORGE FEEnEr-ucK. SHAVER, a citizen of the United States, anda resident of New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Devices for Cutting in Branch Lines upon h[echanical-Telephone Lines, of which the following is a specification.

The object of my invention is to provide the means for cutting in branch wires at right angles with the main trunk line of a mechanicaltelcphone line in such a manner that articulate speech and other sounds may be transmitted from the branch wire to the mainline or from the main line to the branch wire without loss of power or impairing the articulation. The means whereby this end is attained is shown in the accompanying drawings, of which- Figure 1 shows a plan view of the device adjusted upon a line-wire, and Fig. 2 represents an end view of a detail called the counter-weight and insulator.

Like letters refer to like parts in both drawings.

T T T represent the diaphragms of three telephones, two of which being connected with the main trunk line A A, the other bein g connected to a branch wire 0.

The branch line C is cut in upon the trunk line A A by means of a bow-shaped tempered steel-wire vibrator B, terminating at either endin hooks l) b,which engage with the main trunk line A A.

A counter-weight and insulator D G is attached to the main line at a point midwaybetween the terminal hooks of the vibrator B by means of a double hook E, one end of which engages the main line and the other passes through an aperture in the counterweight D and is provided with an envelope of insulating material F, made, preferably, of soft rubber. The counterweight D is made of cast-iron and is .recessed at the end opposite the hook E, in order to receive a sleeve insulater of soft rubber G and a metallic band H. The guy-wire I is adjusted around both G and H.

The object of the band ll is to prevent the guy-wire 1 from cutting into the rubber sleeve G when tension is applied to the guy-wire.

The operation of the device is as as follows: The trunk line A A is first erected and the tension applied in the usual manner, after which the branch wire 0 is erected and the vibrator B placed in position. The counterweight and insulator D G is then placed in position and tension is applied to the branch line C and counter-weight by pulling upon the guy-wire I until the requisite tension is secured, after which the guy-wire is made fast by securing the same to the pole J or other rigid support. The action of setting tension upon the branch line C and counter-weightD imparts tension to the vibrator B and slightly elongates the same, thus bringing into action the resilience of the spring-steel vibrator B and causing it to become peculiarly sensitive to vibration imparted to it from the main or branch lines and to transmit vibrations received from either of the connected lines to the other without loss of power or distinctness of articulation. The action of the counterweight D is to force the vibration to pass over or through the vibrator B to the branch line (J, instead of mainly following the trunk line A A from end to end, as I have found in practice to be the case when the counter-\veightis not used. The counter-weight also prevents the vibration from running off over the guywire and the consequent loss of vibratory power.

\Vhat I claim as new, and desire to secure byLetters Patent, is v 1. A cutting in device for mechanical-telephone lines, consisting of a bow-shaped springvibrator interposed between a main trunk line and a branch line and forming a part of a trunk-line circuit, in combination with a tension-setting guy adjusted upon said main trunk line at a point opposite said branch line, substantially as herein set forth.

2. A cutting-in device for mechanical-telephone lines, consisting of a spring-vibrator provided with terminal hooks for engagement with a main trunk line at two separate points, in combination with a branch line attached to the center of said vibrator, and a counterweight, insulator, and tension-setting guy attached to said trunk line at a point midway Signed at New York, in the county of New between the terminal hooks of the said vi- York and State of New York, this 21st day of 1.0 brator, substantially as herein set forth. March, A. D. 1890.

3. In a cutting-in device for mechanical-tele- 5 phone lines, the combination of the vibrator GEORGE FREDERICK SHAVER Witnesses:

H. J. FooTNER, M. CARSON.

B, hook E, counter-weight D, insulator G, and tension-guy I'With main line A and branch line C, substantially as herein set forth. 

